Your shutter speed must be the same with your ISO, so kung ISO100 - shutter speed is 100.

not in all conditions. the shutter speed should also be based on the focal length of your lens. your 1/x should be equal or at least exceed the focal length of your lens specially if you're shooting handheld. if you're shooting with a telephoto lens, like a 70-200, a shutter speed of only 100 would increase the risk of camera shake or blurs.

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"Amateurs worry about equipment, professionals worry about money, masters worry about light... I just take pictures..."-Vernon Trent

spot on tips. it would be an advantage to try first priority setting/mode before going on full manual for you to get a grip on your camera settings on different light situations.

not in all conditions. the shutter speed should also be based on the focal length of your lens. your 1/x should be equal or at least exceed the focal length of your lens specially if you're shooting handheld. if you're shooting with a telephoto lens, like a 70-200, a shutter speed of only 100 would increase the risk of camera shake or blurs.

for a beginner, I like telling them to keep the ISO static at 400, which is also the speed of the most widely available film speed. That way they can focus on shutter speed and aperture first. Even flash technique. And besides, back in the day you had to choose just one speed for 12 to 36 shots, and only change it the next time you need to feed another roll.

spot on tips. it would be an advantage to try first priority setting/mode before going on full manual for you to get a grip on your camera settings on different light situations.

not in all conditions. the shutter speed should also be based on the focal length of your lens. your 1/x should be equal or at least exceed the focal length of your lens specially if you're shooting handheld. if you're shooting with a telephoto lens, like a 70-200, a shutter speed of only 100 would increase the risk of camera shake or blurs.

Thanks for pointing that out.I was basing my answer on the fact that the threadstarter is new to photography,I imagine his Nikon 3200 is equipped with the 18-55mm kit lens that comes with it, which is the perfect focal length in terms of handheld photography.Shooting handheld with a 200mm will be a bit of a challenge, especially in low light conditions. Without a tripod, you have to increasethe ISO to match the minimum shutter speed to prevent camera shake (but higher ISO means higher noise, so you have to find what is acceptable to you) or shootwide open which in most cases can soften your image.